Download Types Of Plate Boundaries

 Scientists
identify the boundaries
between two plates by the plate
movement.
 There are three types of plate
boundaries:
1. Divergent
2. Convergent
3. Transform
Convection currents in the mantle
Cause plates to collide, pull apart or slide
Material in mantle is heated
floats to surface
as it cools it moves back towards the core
A divergent
boundary is a
boundary
where two
plates are
moving away
from each
other.
This is an
example of a
divergent
boundary.
Bridge across the Alfagaria Rift Valley in southwest Iceland, that is part of
the boundary between the Eurasian and North American continental
tectonic plates.
A

Rift Valley is a deep valley located on divergent
boundaries.
Remember the mid-ocean ridge? The middle part of
the mid-ocean ridge is called a rift valley.
 Rift
= crack
 Seafloor spreading
occurs at divergent
boundaries

As divergent boundaries widen rift valleys form and create new

crust from magma that makes its way to the surface.
As lava builds up it forms underwater mountain ranges .
Ex. Mid-Atlantic Ridge
A
Convergent Boundary is a boundary
between two plates that are moving
toward each other.
1.Continental/Continental-
Two plates run into each other and crumble. Folded
mountains are created.
ex. Himalayas
2.Oceanic/Continental-
Crust collide, and trenches are formed in the ocean floor.
Melted rock from the subducted plate begins to move
upward fueling volcanoes.
ex. Andes Mountains
3.Oceanic/Oceanic-
Plate is subducted beneath another plate along a
trench as a result underwater volcanic mountains erupt.
ex. Aleutian Island
One important
feature is a deepsea trench. These
form along the
subduction zone.
Subduction Boundary – When an oceanic plate plunges beneath another plate
it is said to be sub-ducting beneath the overriding plate. This boundary
between the two plates is a subduction boundary. Ex. Andes Mountains
These boundaries can occur between two ocean plates or and ocean and
continental plate.
 Collision
Boundary – The boundary that
forms when two continents collide is called
a collision boundary.
 Mountain ranges are usually formed along
such boundaries.

A Transform Boundary is a boundary between two
plates that are sliding past each other.
• Fault- break in Earth’s crust
 Movement
along transform boundaries is
not uniform and can sometimes cause
earthquakes.
The San Andreas Fault in North
America is an example of a
Transform Boundary.